Stanley J4990-SMA Proto 3/8-inch Drive 7 Piece Metric Hex Bit Set Made of alloy steel. Polished chrome finish. Set includes socket bar and socket clips. Short metric hex bits for working in tight spaces. Proto 3/8" Drive 6 Piece Metric Hex Bit Set Includes the following items: J4990-4M, J4990-5M, J4990-6M, J4990-7M, J4990-8M, J4990-9M, J4990-10M, J2584, J2591.